Aqueduct of Barcino
About
A modest masonry line, nothing on Segovia's scale, ran about 11.3 kilometers overland from springs in the Montcada hills to keep the working colony supplied; a short stretch of arcading survives beside the medieval Archdeacon's House. An inscription ties construction to Trajan's reign (98-117 CE), meaning it had already been carrying water for some years by the 117 CE snapshot at the latest. A once-proposed second line from Collserola is now considered not Roman at all, per a recent academic reassessment — this Montcada aqueduct is Barcino's one confirmed Roman line.
What happened here
Water arrives day and night and never stops. The channel runs mostly underground, following a shallow gradient measured out with a levelling instrument over tens of miles, and it goes up on arches only where the ground drops away. Inspection shafts sit at intervals; gangs work the line constantly, cutting out the lime crust that thickens on the walls and narrows the flow. At the town end the water is divided in a distribution tank — public fountains first by law, then baths, then private houses whose owners have paid for a pipe of a fixed and stamped size. Illegal tappings are a permanent scandal. What arrives is not stored but runs continuously, and the overflow flushes the drains.
Sources
Nearby
Roman Maps shows the empire frozen at 11 August 117 CE, the day Trajan died — its moment of greatest territorial extent. Explore the full map →